Hello are you asking about a sewing project or an artist wall piece? I am not sure, more additional information might be helpful.
Did you see a project you can't find?
What are you decorating?
Are you trying to cover something?
Here's a cool tutorial on painting on black canvas: https://www.youtube.com/watch?v=rslIbMfBmGo
If that's not the kind of thing you're looking for, just let me know, and I'll try to help you find what you want!
Could you give us more information about what you are wanting to decorate?
I'm not super sure what type of canvas you mean, but if it's the kind of wall art canvas that comes in black, I have a really cool gold leaf project that I made on black canvas that you might like, hope that helps :) https://www.justalittlecreativity.com/2017/04/diy-metal-leaf-wall-art.html